At 12:40 am on 1 December 1928, a man aged in his 20s was found lying unconscious on a street in Perth. He had severe injuries to his head and was taken to Perth Hospital for treatment. Several days later a trepanning operation was performed and, while it was successful, it may have caused him to develop encephalitis. When the man eventually regained consciousness, he had lost all knowledge of his identity.
The operation, however, though it restored Brown to life, robbed him of some portion of his mental faculties and, from that day, he has been unable to remember any incident which took place before the operation. His life, up to that date, has been a blank to him ever since.
At the time of his admittance to hospital his address was recorded as the Horseshoe Coffee Palace in Perth. Also provided was the name of a friend who lived in Subiaco. Despite police efforts to locate the person, no one by that name was found. The man had no other relatives or friends and he remained in hospital, unidentified, for nearly a year. He was eventually dubbed, William Brown.
Excitement was caused in Northam when it was reported that a strange creature had been seen on two or three successive nights in the Avon River, near the Central Bridge.
On 14 January 1929, The West Australian broke the story of the strange creature in the Avon River. While some swore that what they had seen was a small alligator resting on a sandbank, others stated that it was a shark. Most people however felt that both speculations were incorrect and that it was most likely just a large lizard. Whatever it was, Police found the claims to be serious enough that, at 1am in the morning, they attempted a search and, during the day, a Constable patrolled the bridge with a rifle. With no success, a more thorough investigation was organised to take place on 15 January.
Hundreds of people lined the riverbanks and the bridges and watched the Police carry out their search, all to no avail. Despite descriptions (said to be five feet long) and the occasional sighting, the monster eluded capture.
By the 16 January, the monster was still at large.